Wang Xue, Chang Lulu, Shi Xiaolong, Wang Lihai
College of Engineering and Technology, Northeast Forestry University, Harbin 150040, China.
Materials (Basel). 2019 Apr 29;12(9):1386. doi: 10.3390/ma12091386.
In this study, jute fabrics/epoxy-laminated composites were fabricated via a simple and effective manual layering. Hot-alkali treatment was used to pretreat jute fabrics to improve their interfacial compatibility. The effects of hot-alkali treatment with five concentrations (2%, 4%, 6%, 8% and 10%) on the composition, crystallinity and surface morphology of jute fibers, were analyzed with the aids of Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), and the scanning electron microscope (SEM). The mechanical properties (tensile and flexural) of laminated composites, and the morphology of the tensile fracture surface, were analyzed. The results indicated that the crystallinity index (CI) and crystallite size (CS) of the cellulose in jute fibers were improved, and there were three stages for CI and CS with the increase of alkali concentrations. Hot-alkali treatment improved the mechanical properties of laminated composites, especially for the 6% NaOH-treated jute fabric reinforced. The tensile strength, flexural strength, tensile modulus and flexural modulus of 6% NaOH-treated fabrics reinforced composites were enhanced by 37.5%, 72.3%, 23.2% and 72.2%, respectively, as compared with those of untreated fabrics reinforced composites. The fiber pull-out and the gaps of the tensile fracture surface were reduced after hot-alkali treatment.
在本研究中，通过简单有效的手工铺层法制备了黄麻织物/环氧层压复合材料。采用热碱处理对黄麻织物进行预处理，以提高其界面相容性。借助傅里叶变换红外光谱（FTIR）、X射线衍射仪（XRD）和扫描电子显微镜（SEM），分析了五种浓度（2%、4%、6%、8%和10%）的热碱处理对黄麻纤维的组成、结晶度和表面形态的影响。分析了层压复合材料的力学性能（拉伸和弯曲）以及拉伸断裂表面的形态。结果表明，黄麻纤维中纤维素的结晶度指数（CI）和微晶尺寸（CS）得到了提高，且随着碱浓度的增加，CI和CS呈现三个阶段的变化。热碱处理提高了层压复合材料的力学性能，尤其是对于经6%氢氧化钠处理的黄麻织物增强的复合材料。与未处理织物增强的复合材料相比，经6%氢氧化钠处理的织物增强复合材料的拉伸强度、弯曲强度、拉伸模量和弯曲模量分别提高了37.5%、72.3%、23.2%和72.2%。热碱处理后，纤维拔出和拉伸断裂表面的间隙减小。
